ATtiny85 Fuses Explained

In the world of microcontrollers, a fuse is not only a hardware device that protects circuitry from electrical overload, it’s also a concept of low-level configuration settings stored in non-volatile memory. These fuses are typically used to set hardware configuration parameters like clock sources and boot sequences, things that are essential when initializing the microcontroller. Once set, these fuses remain set until explicitly changed, even if new firmware is flashed into the program memory.